Java Android错误找不到符号

伙计们！最近，我在android应用程序项目中遇到了这个错误java:not-find symbol。我不知道是哪里出了问题。以下是我的文件详细信息：

导航栏布局.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/navigation_bar"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="#515151"
            android:layout_alignParentTop="true">
<!--Back-->
<ImageView android:id="@+id/back_icon"
           android:layout_width="50dp"
           android:layout_height="50dp"
           android:padding="5dp"
           android:layout_centerVertical="true"
           android:layout_alignParentLeft="true"
           android:src="@drawable/back_icon"/>
<!--Title-->
<TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"/>
<!--Menu-->
<ImageView
        android:id="@+id/menu"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:padding="5dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"/>
</RelativeLayout>

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;    

public class NavigationBar extends RelativeLayout implements OnClickListener{
public NavigationBar(Context context){
    this(context, null);
}

private ImageView backImageView;
private TextView titleView;
private ImageView menuImageView;

public NavigationBar(Context context, AttributeSet attrs){
    super(context, attrs);

    View view     = LayoutInflater.from(context).inflate(R.layout.navigation_bar_layout, this, true);
    backImageView = (ImageView) view.findViewById(R.id.back_icon);
    titleView     = (TextView) view.findViewById(R.id.title);
    menuImageView = (ImageView) view.findViewById(R.id.menu);

    backImageView.setOnClickListener(this);
    menuImageView.setOnClickListener(this);
}


public ImageView getBackImageView(){ return backImageView; }
public TextView getTitleView(){ return titleView; }
public ImageView getMenuImageView(){ return menuImageView; }

public void setTitle(String title){ titleView.setText(title); }

private ClickCallBack clickCallBack;
public void setClickCallBack(ClickCallBack clickCallBack){ this.clickCallBack = clickCallBack; }
public static interface ClickCallBack{
    void onBackClick();     
    void onMenuClick();     
}

@Override
public void onClick(View v) {
    int id = v.getId();
    if(id == R.id.back_icon){
        clickCallBack.onBackClick();
        return;
    }
    if(id == R.id.menu){
        clickCallBack.onMenuClick();
        return;
    }
  }
}

Error:(24, 9) java: cannot find symbol
symbol:   variable backImageView
location: class com.example.MyFirstAndroidApp.NavigationBar
Error:(24, 37) java: cannot find symbol
symbol:   variable view
location: class com.example.MyFirstAndroidApp.NavigationBar
Error:(25, 36) java: cannot find symbol
symbol:   variable view
location: class com.example.MyFirstAndroidApp.NavigationBar
Error:(26, 37) java: cannot find symbol
symbol:   variable view
location: class com.example.MyFirstAndroidApp.NavigationBar

这里是错误控制台：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/navigation_bar"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="#515151"
            android:layout_alignParentTop="true">
<!--Back-->
<ImageView android:id="@+id/back_icon"
           android:layout_width="50dp"
           android:layout_height="50dp"
           android:padding="5dp"
           android:layout_centerVertical="true"
           android:layout_alignParentLeft="true"
           android:src="@drawable/back_icon"/>
<!--Title-->
<TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"/>
<!--Menu-->
<ImageView
        android:id="@+id/menu"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:padding="5dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"/>
</RelativeLayout>

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;    

public class NavigationBar extends RelativeLayout implements OnClickListener{
public NavigationBar(Context context){
    this(context, null);
}

private ImageView backImageView;
private TextView titleView;
private ImageView menuImageView;

public NavigationBar(Context context, AttributeSet attrs){
    super(context, attrs);

    View view     = LayoutInflater.from(context).inflate(R.layout.navigation_bar_layout, this, true);
    backImageView = (ImageView) view.findViewById(R.id.back_icon);
    titleView     = (TextView) view.findViewById(R.id.title);
    menuImageView = (ImageView) view.findViewById(R.id.menu);

    backImageView.setOnClickListener(this);
    menuImageView.setOnClickListener(this);
}


public ImageView getBackImageView(){ return backImageView; }
public TextView getTitleView(){ return titleView; }
public ImageView getMenuImageView(){ return menuImageView; }

public void setTitle(String title){ titleView.setText(title); }

private ClickCallBack clickCallBack;
public void setClickCallBack(ClickCallBack clickCallBack){ this.clickCallBack = clickCallBack; }
public static interface ClickCallBack{
    void onBackClick();     
    void onMenuClick();     
}

@Override
public void onClick(View v) {
    int id = v.getId();
    if(id == R.id.back_icon){
        clickCallBack.onBackClick();
        return;
    }
    if(id == R.id.menu){
        clickCallBack.onMenuClick();
        return;
    }
  }
}

Error:(24, 9) java: cannot find symbol
symbol:   variable backImageView
location: class com.example.MyFirstAndroidApp.NavigationBar
Error:(24, 37) java: cannot find symbol
symbol:   variable view
location: class com.example.MyFirstAndroidApp.NavigationBar
Error:(25, 36) java: cannot find symbol
symbol:   variable view
location: class com.example.MyFirstAndroidApp.NavigationBar
Error:(26, 37) java: cannot find symbol
symbol:   variable view
location: class com.example.MyFirstAndroidApp.NavigationBar

有什么想法吗？

是Android上下文中使用的术语，用于指示何时解析XML布局资源并将其转换为视图对象的层次结构

你应该试试看

 View view = LayoutInflater.from(context).inflate(R.layout.navigation_bar_layout,null);

然后

清理重建项目

对于第二个问题，您应该检查
在运行之前清理您的项目。我看到的一件事是，您给了您的RelativeLayout属性布局\u alignParentTop，但这个RelativeLayout似乎是父项…但我猜您导入了错误的R.文件。（或没有）。如果有导入android.R，删除它并导入你的R.文件..好吧，@IntelliJ Amiya在我应用了充气（R.layout.navigation\u bar\u layout，null）之后，这可能真的是一个好方法；视图符号错误已修复，但backImageView符号错误仍会出现。谢谢@IntelliJ Amiya！我不知道问题出在哪里，但当我重新格式化代码时，错误被修复了，我想可能是注释或空白导致了问题。无论如何，谢谢你。我想知道充气（R.layout.navigation\u bar\u layout，null）和充气（R.layout.navigation\u bar\u layout，this，true）之间有什么区别？好吧，尽管我对它们之间的区别没有绝对清楚的理解，我会花很多时间仔细阅读API。无论如何，非常感谢！